content: /*******************************************************************************
   * Copyright 2011, 2012 Chris Banes.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   *******************************************************************************/
  package com.handmark.pulltorefresh.library.internal;
  
  import android.annotation.SuppressLint;
  import android.content.Context;
  import android.content.res.TypedArray;
  import android.graphics.Matrix;
  import android.graphics.drawable.Drawable;
  import android.view.View;
  import android.view.ViewGroup;
  import android.view.animation.Animation;
  import android.view.animation.RotateAnimation;
  import android.widget.ImageView.ScaleType;
  
  import com.handmark.pulltorefresh.library.PullToRefreshBase.Mode;
  import com.handmark.pulltorefresh.library.PullToRefreshBase.Orientation;
  import com.handmark.pulltorefresh.library.R;
  
  @SuppressLint("ViewConstructor")
  public class FlipLoadingLayout extends LoadingLayout {
  
  	static final int FLIP_ANIMATION_DURATION = 150;
  
  	private final Animation mRotateAnimation, mResetRotateAnimation;
  
  	public FlipLoadingLayout(Context context, final Mode mode, final Orientation scrollDirection, TypedArray attrs) {
  		super(context, mode, scrollDirection, attrs);
  
  		final int rotateAngle = mode == Mode.PULL_FROM_START ? -180 : 180;
  
  		mRotateAnimation = new RotateAnimation(0, rotateAngle, Animation.RELATIVE_TO_SELF, 0.5f,
  				Animation.RELATIVE_TO_SELF, 0.5f);
  		mRotateAnimation.setInterpolator(ANIMATION_INTERPOLATOR);
  		mRotateAnimation.setDuration(FLIP_ANIMATION_DURATION);
  		mRotateAnimation.setFillAfter(true);
  
  		mResetRotateAnimation = new RotateAnimation(rotateAngle, 0, Animation.RELATIVE_TO_SELF, 0.5f,
  				Animation.RELATIVE_TO_SELF, 0.5f);
  		mResetRotateAnimation.setInterpolator(ANIMATION_INTERPOLATOR);
  		mResetRotateAnimation.setDuration(FLIP_ANIMATION_DURATION);
  		mResetRotateAnimation.setFillAfter(true);
  	}
  
  	@Override
  	protected void onLoadingDrawableSet(Drawable imageDrawable) {
  		if (null != imageDrawable) {
  			final int dHeight = imageDrawable.getIntrinsicHeight();
  			final int dWidth = imageDrawable.getIntrinsicWidth();
  
  			/**
  			 * We need to set the width/height of the ImageView so that it is
  			 * square with each side the size of the largest drawable dimension.
  			 * This is so that it doesn't clip when rotated.
  			 */
  			ViewGroup.LayoutParams lp = mHeaderImage.getLayoutParams();
  			lp.width = lp.height = Math.max(dHeight, dWidth);
  			mHeaderImage.requestLayout();
  
  			/**
  			 * We now rotate the Drawable so that is at the correct rotation,
  			 * and is centered.
  			 */
  			mHeaderImage.setScaleType(ScaleType.MATRIX);
  			Matrix matrix = new Matrix();
  			matrix.postTranslate((lp.width - dWidth) / 2f, (lp.height - dHeight) / 2f);
  			matrix.postRotate(getDrawableRotationAngle(), lp.width / 2f, lp.height / 2f);
  			mHeaderImage.setImageMatrix(matrix);
  		}
  	}
  
  	@Override
  	protected void onPullImpl(float scaleOfLayout) {
  		// NO-OP
  	}
  
  	@Override
  	protected void pullToRefreshImpl() {
  		// Only start reset Animation, we've previously show the rotate anim
  		if (mRotateAnimation == mHeaderImage.getAnimation()) {
  			mHeaderImage.startAnimation(mResetRotateAnimation);
  		}
  	}
  
  	@Override
  	protected void refreshingImpl() {
  		mHeaderImage.clearAnimation();
  		mHeaderImage.setVisibility(View.INVISIBLE);
  		mHeaderProgress.setVisibility(View.VISIBLE);
  	}
  
  	@Override
  	protected void releaseToRefreshImpl() {
  		mHeaderImage.startAnimation(mRotateAnimation);
  	}
  
  	@Override
  	protected void resetImpl() {
  		mHeaderImage.clearAnimation();
  		mHeaderProgress.setVisibility(View.GONE);
  		mHeaderImage.setVisibility(View.VISIBLE);
  	}
  
  	@Override
  	protected int getDefaultDrawableResId() {
  		return R.drawable.default_ptr_flip;
  	}
  
  	private float getDrawableRotationAngle() {
  		float angle = 0f;
  		switch (mMode) {
  			case PULL_FROM_END:
  				if (mScrollDirection == Orientation.HORIZONTAL) {
  					angle = 90f;
  				} else {
  					angle = 180f;
  				}
  				break;
  
  			case PULL_FROM_START:
  				if (mScrollDirection == Orientation.HORIZONTAL) {
  					angle = 270f;
  				}
  				break;
  
  			default:
  				break;
  		}
  
  		return angle;
  	}
  
  }
  